Nutrient deficiencies and excesses in cannabis plants cause that we do not obtain an optimal result in the crop. Therefore we must try to avoid and correct that plants develop deficiencies and excesses.
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NUTRIENT DEFICIENCIES AND EXCESSES IN CANNABIS PLANTS
To determine a deficiency or excess we have to know what the nutrients are, the types that exist and how they act in the plant.
What are nutrient deficiencies?
The deficiencies are the lack or inadequate feeding of some nutritious element. To avoid deficiencies, we must pay the cannabis cultivation with the needed nutrients.
What are nutrient excesses?
Excesses are accumulations of salts in the metabolism of plants. To avoid excesses, we must carry out a balanced diet appropriate to the type of crop, substrate and cultivated genetics. Each plant genetics will have specific needs for nutritional elements.
HOW TO DETECT NUTRIENT DEFICIENCIES AND EXCESSES IN CANNABIS CULTURE
To detect an excess or deficiency we must be attentive and observe the color and condition of the leaves. These will tell us what kind of deficiency or excess is suffering since they are a reflection of what happens with nutrition.
It is always easier to correct a deficiency than an excess, so it is not advisable to go overboard with nutrients.
Excesses are more difficult to correct because we will have to perform a root wash, use a nutrient cleaner and provide enzymes that help break down dead roots. And it will lead to a delay in the development of the plant.
It should be noted that the larger the plant, the more nutrients it will require to feed its large root system.
The deficiencies cause stress in the plant and we will obtain weaker plants that are susceptible to pests and fungi. They will also affect the final yield, obtaining buds with less flavor, weight, size and potency.
While excesses will cause burns on the leaves and alter the taste of the buds.
To avoid deficiencies and excesses it is important to measure, adjust and stabilize your EC (electro conductivity) and PH. Often the pH in the growing medium is the cause of a nutrient deficiency. The optimal pH is between 5.2 and 6.2, for this we recommend that you read our news Importance of Ph in Growing Marijuana
Measuring the EC we will know the levels of salts and we can adjust the amount of nutrients.
It must be borne in mind that sometimes the deficiencies and excesses are not only due to lack or excess of fertilizer but also due to another type of problem that does not allow the plant to absorb the necessary nutrients.
There are many types of deficiencies and excesses that our plants can suffer. Below we detail the most important ones to know how to detect them in time and correct them.
To solve many excesses or saturation of nutrients in our plants, the use of enzymes is recommended for a better absorption of nutrients and we can also carry out a washing roots with water. This consists of adding double or triple the amount of water that the pot has as substrate to each pot. For example, in a pot of 25 liters of substrate, we would throw between 50 to 75 liters of water. That it drains well and the water that does not remain in a plate or container, since it is not good that it reabsorbs the cleaning water.
NUTRIENT DEFICIENCIES AND EXCESSES
SULFUR EXCESS OR DEFICIENCY
EXCESS OF SULFUR
The plant is smaller and the development is uniformly smaller
The leaves turn dark green
When the excess is severe, the tips and edges of the leaves can discolor and burn
SULFUR DEFICIENCY
Sprouts form weakly and slowly
Young leaves turn yellowish lime color and their growth stagnates
Leaf veins turn yellow
The tips of the leaves can burn, darken and hook down
If the plant also has a general nutrient deficiency, long purple spots appear on the new stems.
The stem becomes woody
EXCESS OR DEFICIENT CALCIUM
EXCESS OF CALCIUM
New leaves wither
Growth may be stunted
Blocks the absorption of potassium, iron and manganese
CALCIUM DEFICIENCY
Delayed plant growth and decreased harvest
Flower development is slow
Yellowish-brown spots along the edge and surface of the leaves
Lower leaves begin to stoop and curl
The roots begin to recede
MATCH EXCESS OR DEFICIENCY
EXCESS OF PHOSPHORUS
New leaves grow thin and develop chlorosis
Burns on the tips and edges of the leaves
Less internodal space
Lower leaves curl and develop spots
The buds once dry take on a chemical flavor
Root tips die back
Harvest decrease
PHOSPHORUS DEFICIENCY
Vertical and lateral growth slows
The plant is weakened and is more susceptible to diseases and pests
Petioles turn dark purple
Leaves turn blue-green or dark purple
The most affected leaves develop a dark metallic bronze color, they curl, wilt and fall
IRON EXCESS OR DEFICIENCY
EXCESS OF IRON
Leaves turn bronze in color, with dark brown spots on smaller leaves
Phosphorus absorption deteriorates and signs appear on the lower leaves
LACK OF IRON
Young shoots and leaves develop chlorosis, starting from the side opposite the tip of the leaf
As the deficiency progresses, the larger leaves show chlorosis in the veins
Leaves can develop necrosis and fall
Phosphorus absorption deteriorates and signs appear on the lower leaves
MAGNESIUM EXCESS OR DEFICIENCY
EXCESS OF MAGNESIUM
Stunted growth
Dark green foliage
Symptoms appear as if they were salt toxicity
MAGNESIUM DEFICIENCY
The plant looks sick in general
Deficiencies exist 4-6 weeks before they become externally evident
Brown / yellow spots and irregularities appear on old and middle-aged leaves
Old leaves dry out, curl and tend to fall
NITROGEN EXCESS OR DEFICIENCY
EXCESS OF NITROGEN
Stems and foliage weaken
The greenery of the plant rises
Inner leaves turn dark green
The water transport system is weakened
The harvest tastes green
NITROGEN DEFICIENCY
Plants are smaller
Smaller and less shiny leaves
The leaves turn yellow
The yellow color of the leaves rises throughout the plant
Low leaves curl, discolor and fall
Premature flowering and low production
POTASSIUM EXCESS OR DEFICIENCY
EXCESS OF POTASSIUM
New leaves grow thin and develop chlorosis
Burns on the tips and edges of the leaves
Less internodal space
Lower leaves curl and develop spots
The root zone becomes more acidic
The tips of the roots recede
POTASSIUM DEFICIENCY
Older leaves turn pale and suffer from chlorosis
The edges and tips of the leaves turn rust-colored and burn
Branching of new stems may increase
Flowering slows and decreases
Stems become weak, scrawny, and very brittle
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We recommend reading our news Fertilizers and fertilizers for growing Marijuana on Land
Information extracted from: Canna Deficiencies guide
